21766794 has 32 divisors (see below), whose sum is σ = 50084736. Its totient is φ = 6177600.

The previous prime is 21766757. The next prime is 21766831. The reversal of 21766794 is 49766712.

It is an interprime number because it is at equal distance from previous prime (21766757) and next prime (21766831).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4944 + ... + 8244.

It is an arithmetic number, because the mean of its divisors is an integer number (1565148).

Almost surely, 2^21766794 is an apocalyptic number.

21766794 is an abundant number, since it is smaller than the sum of its proper divisors (28317942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21766794 is a wasteful number, since it uses less digits than its factorization.

21766794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470.

The product of its digits is 127008, while the sum is 42.

The square root of 21766794 is about 4665.4896849098. The cubic root of 21766794 is about 279.2103345764.

The spelling of 21766794 in words is "twenty-one million, seven hundred sixty-six thousand, seven hundred ninety-four".